Atlanta Indoor Pool Use of photovoltaics and a solar-thermal heat system at a pool.

Bike Race A solar bike is being tuned for a race.

Earth from the Galileo Space Probe This image of Earth was taken by the Galileo space probe on December 11, 1990, when Galileo was 2 million kilometers (1.3 million miles) from Earth.

Flat-Plate Collector A flat-plate collector provides hot water for the U.S. Environmental Protection Agency, in Washington, DC.

Georgetown Center Photovoltaic panels provide electricity for the Intercultural Center at Georgetown University in Washington, DC.

Georgetown Center: Roof Close-up The roof of the Georgetown Intercultural Center is angled at 45 degrees to catch the Sun’s rays.

Georgetown Intercultural Center This solar collection system supplies 40% of the building’s energy needs.

Moon from Apollo 11 This photograph of the Moon was taken by the Apollo 11 astronauts as they traveled toward their famous rendezvous with the lunar surface.

Moon Orbiting the Earth This image was captured by the Galileo spacecraft in 1992 as it flew by Earth at a distance of 6.2 million km (3.9 million miles).

Plane Shadow A plane and its shadow approach Denver airport. Which will hit the runway first?

Solar Household This house with sloped glass is an example of passive solar energy use.

Solar Power in Brazil These houses in Brazil use photovoltaic panels for electricity.

Solar System Earth is one of the nine planets that revolve around the Sun in our solar system.

The Sun from Space An image of the Sun from the SOHO Extreme Ultraviolet Imaging Telescope.

Sunracer This photovoltaic-powered vehicle, from the University of Michigan, won the Sunrayce in 1993.

Tracing Shadows A student at Harding School in El Cerrito, California, traces his partner's shadow.

Water Monitor Photovoltaics power a water-level monitoring station on the Laramie River in central Wyoming.

Wind Farm The wind turbines on this wind farm provide inexpensive electricity.

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